Influence of temperature on the demographics and control efficiency of Aphelinus asychis, a parasitoid of the cabbage pe
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Influence of temperature on the demographics and control efficiency of Aphelinus asychis, a parasitoid of the cabbage pest, Myzus persicae Sheng Yin Wang
&
Dayu Zhang & Tong-Xian Liu
Received: 26 September 2019 / Accepted: 25 May 2020 # Springer Nature B.V. 2020
Abstract Aphelinus asychis has been used to control various species of aphids. Temperature is a crucial abiotic factor for the development and reproduction of insects. This study examined the influence of different constant temperatures (20, 25 and 30 °C) on the longevity, net reproductive rate (R0), intrinsic rate of increase (r), net killing rate (Z0) and finite killing rate (θ) of A. asychis parasitizing the cabbage pest Myzus persicae, and compared its control efficiency. The results showed that increasing temperature decreased the longevity of A. asychis significantly. The value of r was significantly higher at 30 °C than at 25 and 20o C. Similarly, θ was significantly higher at 30 °C (0.7163 aphids) than at 25 (0.5654 aphids) and 20o C (0.3522 aphids). Aphelinus asychis could produce progeny successfully within the range of 20-30 °C and its control efficiency was higher at high temperatures than at low temperatures. We S. Y. Wang : D. Zhang College of Agricultural and Food Science, Zhejiang A&F University, Hangzhou city 311300 Zhejiang province, China
S. Y. Wang e-mail: [email protected] D. Zhang e-mail: [email protected] S. Y. Wang : T. than 0.97). The population projection (Fig. 7) showed that A. asychis increased much faster at higher temperature. Because A. asychis doesn’t feed during the egg, larval, pupal, and male stage, the trend of total population size was different from that of killing potential. However, the
Temperature, a critical environmental factor, affected the population fitness of insect (Qiu et al. 2006). The optimum temperature for different insect species varies (McClay and Hughes 2007). In this study, we comprehensively evaluated the population parameters (development, longevity and fecundity) and control efficiency of A. asychis under three constant temperature treatments. We found that A. asychis could produce progeny adults successfully under these temperatures. In addition, A. asychis was better adapted to the highest temperature, as it had the shortest development time and the highest intrinsic rate of increase (r) at this temperature.
Phytoparasitica Table 2 Population parameters, host feeding rate, non-effective parasitism rate and killing rate of Aphelinus asychis at three constant temperatures Parameters
20 °C
25 °C
30 °C
Intrinsic rate of increase, r (d−1)
0.1971 ± 0.0049 a
0.2858 ± 0.0070 b
0.3351 ± 0.0080 c
Finite rate of increase, λ (d−1)
1.2179 ± 0.0059 a
1.3308 ± 0.0093 b
1.3982 ± 0.0111 c 175.8 ± 20.6 b
Net reproductive rate, R0 (progeny adults)
228.0 ± 27.2 a
210.4 ± 25.2 ab
Mean generation time, T (d)
27.5 ± 0.4 a
18.7 ± 0.3 b
15.4 ± 0.2 c
Net host feeding rate, C0 (aphids)
37.1 ± 4.2 a
28.2 ± 3.3 b
25.2 ± 3.0 b
Stable host feeding rate, ψ
0.0416 ± 0.0038 a
0.0540 ± 0.005
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